* AwesomeMusic: "Day & Night".
* EarWorm: "Why you gotta play that song so loud? Because we want to! Because we want to!"
* HilariousInHindsight: Go back and watch her video for [[http://www.youtube.com/watch?v=vsYSdmMKCe8 "Because We Want To."]] See if you can watch the beginning (when she gets beamed down from a giant spaceship) and ''not'' make a Series/DoctorWho reference. There's even a very Judoon-like anthropomorphic rhino in the video.
%%* [[HeReallyCanAct She Really Can Act]]
* TransAtlanticEquivalent: Ever since ''Doctor Who'' and ''Secret Diary'' started to pick up steam in terms of popularity in the U.S., more than a few American papers have described her as a British version of BritneySpears. However, since she's had more success as an actress than as a singer, Mandy Moore might be a better comparison (and even then, Moore's acting career hasn't eclipsed her singing career to the extent as Piper's).
* YokoOhNo: When she was dating Ritchie Neville from the band ''Five''. Luckily this is no longer the case, as she is considerably more famous than Ritchie Neville ever was.